wcswidth - determine columns needed for a fixed-size wide
character string
SYNOPSIS
#include <wchar.h>
int wcswidth (const wchar_t *s, size_t n);
DESCRIPTION
The wcswidth function returns the number of columns needed
to represent the wide-character string pointed to by s,
but at most n wide characters. If a non-printable wide
character occurs among these characters, -1 is returned.
RETURN VALUE
The wcswidth function returns the number of column posi
tions for the wide-character string s, truncated to at
most length n.
CONFORMING TO
UNIX98
SEE ALSO
wcwidth(3), iswprint(3)
NOTES
The behaviour of wcswidth depends on the LC_CTYPE category
of the current locale.
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